Davis faces Democrat Ann Callis, a former judge, in this central-Illinois-based district, which includes the state capital of Springfield. National Democrats tout Callis as a top recruit in one of the party's top targets this cycle.

Callis, who defeated physics professor George Gollin in the primary, has yet to announce her first-quarter fundraising, which is due to the Federal Election Commission by April 15. She had $449,000 in cash on hand as of Feb. 26.

Davis won in 2012 by less than a 1-point margin, as President Barack Obama and Mitt Romney each received 49 percent in the district.

Illinois’ 13th District is rated Tilts Republican by Rothenberg Political Report/Roll Call.